Vigabatrin Retinal Toxicity First Detected with Electroretinographic Changes: A Case Report

Area of Science:

• Ophthalmology
• Neurology
• Pharmacology

Background:

• Vigabatrin is an effective antiepileptic drug (AED) for refractory partial seizures and infantile spasms.
• Retinal toxicity and visual field defects are significant concerns limiting its use.
• Early detection of vigabatrin-induced retinal toxicity is crucial for patient management.

Purpose of the Study:

• To describe a case of vigabatrin toxicity.
• To illustrate that electroretinographic (ERG) changes precede imaging and visual field deterioration.
• To highlight the utility of ERG in early toxicity detection.

Main Methods:

• Case report of a patient experiencing vigabatrin toxicity.
• Electroretinography (ERG) to assess retinal function.
• Optical coherence tomography (OCT) for retinal nerve fiber layer (RNFL) imaging.

Main Results:

• A decrease in the maximal ERG b:a ratio was observed.
• This ERG change occurred before thinning of the RNFL on OCT.
• The findings suggest ERG is a sensitive indicator of early retinal damage.

Conclusions:

• Electroretinography (ERG) can detect vigabatrin retinal toxicity before structural changes are visible on OCT or visual field defects occur.
• This emphasizes the importance of regular ERG monitoring in patients treated with vigabatrin.
• Early detection through ERG may allow for timely intervention to prevent irreversible vision loss.